The One Direction star was pictured arriving at a London recording studio on Monday morning to add his voice to the already star studded cover of Simon & Garfunkel’s classic Bridge Over Troubled Water.

Louis, 25, was joined at the studio by The Who icon Roger Daltrey, 73, who is another famous face offering their services to the fundraising track, and Jessie J, 29.

One Direction's Louis Tomlinson was seen arriving at Sarm Studios to record his part of the charity single on Monday (Image: Flynet Pictures Tel)

Simon Cowell, who organised the charity song, described the tower fire as "one of the most shocking things" he's ever seen (Image: Flynet Pictures)

Dressed in black, Jessie J gave a wave to waiting photographers as she headed inside (Image: Flynet Pictures)

The cover of Simon & Garfunkel's Bridge Over Troubled Water will raise money for those affected by the devastating tower block fire (Image: Flynet Pictures)

Louis' old X Factor boss Simon Cowell was the person who organised the charity single (Image: Flynet Pictures)

The cover song was organised by music mogul Simon Cowell in response to the atrocity at Grenfell Tower last week, which left 79 people either dead or missing presumed dead.

Nearly 80 people were taken to hospital following the incident. 18 people remain in hospital today, with nine in critical care.

Flames broke out inside the 24-storey residential tower block in Latimer Road, West London in the early hours of June 13.

The Who icon Roger Daltrey was seen at the recording studio shortly after Louis arrived (Image: Tony Oudot/WENN)

Louis joins a long line of celebrities including Pixie Lott and Stormzy who have already been pictured at the London recording studio (Image: Flynet Pictures)

The song will be released this week with proceedings going to Grenfell Tower fire victims (Image: Rex Features)

A whole string of celebrities have joined forces for the Grenfell Tower charity single including Rita Ora, Leona Lewis, Craig David, Stormzy , Tulisa and Pixie Lott.

Explaining why he felt compelled to organise a charity single, Simon told The Mirror : "Every hour it got worse and worse. You think of yourself in that situation. The loss of life is terrible. Many of the families have got nothing, no insurance.

“I went around to have a look but couldn’t get close. It’s one of the most shocking things I have ever seen. I feel sadness, anger... so many emotions.

“The lack of safety is so bad. There will be huge repercussions.

“It hit me very hard, especially when I heard about the baby being thrown out of the window.

“I was going to send a cheque but I thought we could do more. That’s why we are making a record. It sends a message of support. We got this up and running in 48 hours. I spoke to all the major labels and they got back to me in an hour offering their support.

“I think the community reaction had been wonderful when things go bad. People get together. Its unbelievable.”

Simon urged celebrities who wanted to get involved to contact him, saying those who weren't able to attend the Sarm Studios recording studio could lay down vocals over the phone.